20685877178446 has 8 divisors (see below), whose sum is σ = 31138458227064. Its totient is φ = 10306391102760.

The previous prime is 20685877178443. The next prime is 20685877178543. The reversal of 20685877178446 is 64487177858602.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a super-2 number, since 2×20685877178446² (a number of 27 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20685877178443) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 18273742525 + ... + 18273743656.

It is an arithmetic number, because the mean of its divisors is an integer number (3892307278383).

Almost surely, 2^{20685877178446} is an apocalyptic number.

20685877178446 is a deficient number, since it is larger than the sum of its proper divisors (10452581048618).

20685877178446 is a wasteful number, since it uses less digits than its factorization.

20685877178446 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 36547486466.

The product of its (nonzero) digits is 1011548160, while the sum is 73.

The spelling of 20685877178446 in words is "twenty trillion, six hundred eighty-five billion, eight hundred seventy-seven million, one hundred seventy-eight thousand, four hundred forty-six".